Bag breaking and screening mechanism for drum screen

Abstract

A roller assembly is formed by assembling a roller frame body, a front rolling ring, a rear rolling ring and a plurality of screen plates, a plurality of cross beams are fixedly connected with a plurality of radial rib plates, screen plate orifices are formed between every two cross beams and between every two radial rib plates, and the screen plates are fixedly connected with the front rolling ring and the rear rolling ring. The screen plates are correspondingly mounted on the cross beams and the radial rib plates to cover corresponding screen plate orifices and can be detached; the bag breaking cutter assembly comprises a first cutter set, a second cutter head and a third cutter head, the first cutter set is arranged at intervals along the spiral track of the inner wall of the screen drum, the first cutter set comprises a cutter head, at least three first cutter heads and a fixing clamping plate, and a bolt penetrates through a cutter holder mounting hole of the cutter head and a through hole in the fixing clamping plate located outside the screen drum and is fixed through a nut; and the second tool bit and the third tool bit are correspondingly mounted on the second tool apron and the second tool apron through fasteners. The garbage bag breaking machine is reasonable in structure, the garbage bag breaking rate can be increased, the screen plate and multiple groups of different types of tool bits are convenient to replace, the multi-scene applicability is high, and the treatment cost can be reduced.

Description

Technical Field

[0001] The utility model relates to a bag breaking and screening mechanism for a drum screen, belonging to the technical field of kitchen waste treatment. Background Art

[0002] In the kitchen waste treatment technology, pretreatment + anaerobic digestion is generally used. With the continuous improvement of residents' living standards, the output of kitchen waste is increasing day by day. Kitchen waste has the characteristics of high water content, easy to rot, and complex components. Kitchen waste is often collected and transported in the form of bagged waste. The front-end process of kitchen waste treatment is that the kitchen waste is transported to the wet waste treatment plant by a collection and transportation vehicle. At the kitchen waste resource treatment center, the bagged kitchen waste is unloaded into the hopper and then sent to the back-end bag breaking and sorting equipment through a screw conveyor.

[0003] Drum screens are often used for bagged kitchen waste and broken bags and for primary sorting to achieve preliminary solid-liquid separation. The existing drum screen uses a screen drum, multiple supporting rollers and a bracket. The screen drum is equipped with multiple bag breaking knives. Four supporting rollers are fixed on the bracket. The drum with an inclined angle is placed on the four supporting rollers. The motor and reducer installed on the bracket drive the active roller to rotate through the transmission mechanism. The bag breaking knife in the screen drum is used to break and crush the bagged kitchen waste. The screened material is discharged through the sieve holes on the screen drum and enters the next process, while the screened material is discharged from the drum screen for landfill or incineration. However, the drum of the existing drum screen adopts an integral structure. On the one hand, the sieve hole diameter of the drum is fixed, so the size and length of the screen drum cannot be adjusted according to the material processing volume and the screening particle size. On the other hand, the screen drum, which is a consumable part, can only be replaced as a whole after damage, which increases the processing cost. Although the drum screen is equipped with a bag breaking knife on the inside of the screen cylinder, the knife seat of the bag breaking knife is fixed on the screen cylinder. Although the knife head is replaceable, the position of the knife seat cannot be changed, so it has high requirements on the properties of the material, poor applicability, low bag breaking rate, and easy to cause loss of organic matter. Summary of the invention

[0004] The purpose of the utility model is to provide a bag breaking and screening mechanism for a drum screen which has a reasonable structure, can improve the garbage bag breaking rate, is convenient for replacing the screen plate and multiple groups of different types of cutter heads, has high applicability in multiple scenarios, and can reduce processing costs.

[0005] The technical solution of the utility model to achieve the above-mentioned purpose is: a bag breaking and screening mechanism for a drum screen, characterized in that it includes a drum assembly and a bag breaking knife assembly for breaking bags and crushing materials;

[0006] The drum assembly comprises a drum frame, a front rolling ring, a rear rolling ring and a plurality of screen plates, the drum frame comprises a plurality of cross beams and a plurality of arc-shaped radial ribs, the ends of the plurality of cross beams evenly distributed along the circumference are respectively connected to the front rolling ring and the rear rolling ring and can be disassembled, each radial rib is radially fixed on two cross beams to form a circumferential rib and a plurality of circumferential ribs are provided along the length direction, the front and rear circumferential ribs are respectively connected to the front rolling ring and the rear rolling ring and can be disassembled, mesh plate openings are formed between two cross beams and two radial ribs, the screen plate is an arc-shaped screen plate with screen holes, each screen plate is correspondingly installed on the cross beams and the radial ribs to cover the corresponding mesh plate opening and can be disassembled, and each screen plate is assembled into a circular screen drum; each circumferential rib is provided with at least two second knife seats and at least two third knife seats on the inner wall of the radial rib;

[0007] The bag breaking knife assembly comprises a first knife group, a second knife head and a third knife head. The first knife group is intermittently arranged along the spiral track of the inner wall of the screen cylinder. The first knife group comprises a knife disc, at least three first knife heads and a fixed clamping plate. The knife disc is L-shaped, including a knife head mounting plate and an arc-shaped connecting seat that fits the screen plate. The triangular first knife head is mounted on the upper part of the knife head mounting plate through a fastener. The first knife head and the acute angle side of the top surface of the knife head mounting plate are fixed with an alloy blade. The arc-shaped connecting seat of the knife disc is provided with a knife seat mounting hole. Bolts are passed through the knife seat mounting hole of the arc-shaped connecting seat and the through hole on the fixed clamping plate outside the screen cylinder and fixed with nuts to mount the knife disc on the screen cylinder; the second knife head is correspondingly mounted on the second knife seat through fasteners, and the top of the second knife head has a plurality of pitch tooth blades. The third knife head is correspondingly mounted on the third knife seat through fasteners. The third knife head is a triangular prism with a small top and a large bottom. The third knife head is provided with a cutting edge on the side on the same side as the alloy blade, and the top surface of the third knife head is a plane with acute-angle spikes.

[0008] The bag breaking and screening mechanism of the utility model adopts a roller assembly and a bag breaking knife assembly, and the roller assembly is assembled by a roller frame, a front roller ring, a rear roller ring and a plurality of screen plates. The roller frame adopts a circumferential rib plate formed by a plurality of cross beams and arc-shaped radial rib plates. Since the cross beams and the circumferential rib plates at both ends can be disassembled and installed on the front roller ring and the rear roller ring, when materials of different properties need to be crushed, only the roller assembly needs to be replaced without replacing the entire equipment, thereby greatly reducing the processing cost. Since each screen plate of the utility model can be disassembled and replaced separately, it is convenient for maintenance and installation after the screen plate is damaged, and the aperture size of the screen plate can be adjusted according to the material processing volume and the screening particle size.

[0009] The bag breaking knife assembly of the utility model adopts a first knife group, a second knife head and a third knife head. The first knife group is intermittently arranged along the spiral trajectory of the inner wall of the screen drum, and the second knife head and the third knife head are arranged on the inner side of each circumferential rib plate. When the screen drum rotates, it can target materials of different properties through a combination of multiple knife heads, greatly improve the bag breaking efficiency and crush the materials, and effectively reduce the loss of organic matter.

[0010] The cutter disc of the first cutter group of the utility model is connected to the screen drum by a fixed clamping plate and a fastener, and the first cutter head can be detachably installed on the cutter disc, which is not only convenient for maintenance and replacement of the first cutter group, but also can adjust the installation position of the first cutter group according to the material processing volume, material properties and screening particle size, push the material forward while breaking the bag, and can adjust the material discharge speed.

[0011] The utility model adopts an assembled drum component, and the screen plate and a variety of knife head groups can be installed and disassembled, with a reasonable structure. It is not only easy to maintain, but also highly applicable in multiple scenarios. When realizing the integrated function of bag breaking and screening, the garbage bag breaking rate is ≥98%, the loss rate of easily degradable organic matter is ≤5%, and the low calorific value of the screened material is ≥3000kcal / kg, which can achieve maximum resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The embodiments of the present utility model are further described in detail below in conjunction with the accompanying drawings.

[0013] Figure 1 It is a structural schematic diagram of the bag breaking and screening mechanism of the utility model.

[0014] Figure 2 yes Figure 1 Schematic diagram of the I processing structure.

[0015] Figure 3 yes Figure 1 A schematic diagram of the structure from a side view.

[0016] Figure 4 It is a three-dimensional structural schematic diagram of the bag breaking and screening mechanism of the utility model.

[0017] Figure 5 It is a structural schematic diagram of the first knife group of the utility model.

[0018] Among them: 1—front rolling ring, 1-1—front wear-resistant ring, 1-2—front guide plate, 2—radial rib plate, 2-1—radial bottom plate, 2-2—radial rib plate, 2-3—second knife seat, 2-4—third knife seat, 3—cross beam, 3-1—arc plate, 3-2—cross rib plate, 4—screen plate, 4-1—screen hole, 5—rear rolling ring, 5-1—rear wear-resistant ring, 6—fixed clamping plate, 7—knife disc, 7-1—arc connecting seat, 7-2—knife head mounting plate, 7-3—knife disc reinforcement rib, 7-4—knife seat mounting hole, 8—first knife head, 8-1—alloy blade, 9—second knife head, 10—third knife head. DETAILED DESCRIPTION

[0019] See Figure 1 , 3 As shown in Figure 4, the utility model is a bag breaking and screening mechanism for a drum screen, including a drum assembly and a bag breaking knife assembly for breaking bags and crushing materials.

[0020] See Figures 1 to 4 As shown, the drum assembly of the utility model includes a drum frame, a front roller ring 1, a rear roller ring 5 and a plurality of screen plates 4. The drum frame of the utility model includes a plurality of cross beams 3 and a plurality of arc-shaped radial ribs 2. The ends of the plurality of cross beams 3 evenly distributed along the circumference are respectively connected to the front roller ring 1 and the rear roller ring 5 and can be disassembled. After the front roller ring 1 and the rear roller ring 5 are supported by tooling, the ends of the cross beams 3 are respectively connected to the front roller ring 1 and the rear roller ring 5 by bolts to ensure their coaxiality. Each radial rib plate 2 is fixed radially on two cross beams 3 to form a circumferential rib plate and multiple rib plates are arranged along the length direction. The cross beam 3 and multiple radial rib plates 2 form a support frame for installing the screen plate 4. The circumferential rib plates on the front and rear sides are respectively connected to the front roller ring 1 and the rear roller ring 5 and can be disassembled. The circumferential rib plates on the front and rear sides can be connected to the front roller ring 1 and the rear roller ring 5 by bolts. The roller driving surface on the front roller ring 1 and the roller driving surface on the rear roller ring 5 are frictionally driven by four-point positioning of two active rollers and two driven rollers in the supporting roller group. After the motor power is reduced in speed, it passes through the transmission mechanism to make the active roller friction drive the screen drum to rotate. Figure 1 , 3 As shown in Figures 5 to 6, each circumferential rib of the utility model is provided with at least two second tool seats 2-3 and at least two third tool seats 2-4 on the inner wall of the radial rib 2. The utility model can evenly distribute 2 to 5 second tool seats 2-3 and third tool seats 2-4 on the inner wall of the circumferential rib, and the distance between the center of the second tool seat 2-3 and the center of the adjacent third tool seat 2-4 is 400 to 500 mm. The second tool seat 2-3 and the third tool seat 2-4 are provided with mounting holes for mounting the second tool head 9 and the third tool head 10.

[0021] See Figure 3 , 4As shown, the inner walls of the front rolling ring 1 and the rear rolling ring 5 of the utility model are respectively provided with a plurality of front guide plates 1-2 and rear guide plates with the same inclined angle at intervals in the circumferential direction, and the front guide plates 1-2 and the rear guide plates are arranged front and back in an interlaced manner. The guide plates in the front rolling ring 1 and the rear rolling ring 5 are evenly distributed along the circumferential direction, so that the material can smoothly enter the screen drum and be smoothly discharged from the discharge port, and the overall strength is also improved. Figure 1 , 3 As shown, the outer walls of the front rolling ring 1 and the rear rolling ring 5 of the utility model are respectively fixed with a raised front wear-resistant ring 1-1 and a rear wear-resistant ring 5-1. The front wear-resistant ring 1-1 and the rear wear-resistant ring 5-1 ensure coaxiality with the center of the screen drum and verticality with the end face of the screen drum during welding, which can improve the service life of the drum screen.

[0022] See Figures 1 to 4 As shown, mesh plate openings are formed between two cross beams 3 and two radial ribs 2 of the utility model, and the screen plate 4 is an arc-shaped screen plate with screen holes 4-1. Each screen plate 4 is correspondingly installed on the cross beam 3 and the radial rib 2 to cover the corresponding mesh plate opening and can be disassembled. Each screen plate 4 is assembled to form a circular screen cylinder. The screen plate 4 of the utility model adopts a forming punching circle process, and is customized according to the circle of the screen cylinder diameter. The screen plate 4 is made of 16Mn. The screen holes 4-1 on the screen plate 4 can be punched. The screen holes 4-1 can be round or square. The size of the screen holes 4-1 can be set according to the particle size and processing volume of the kitchen waste to be sorted. Since each screen plate 4 adopts a disassembly structure and can be disassembled and replaced separately, the screen plate 4 can be conveniently replaced according to the particle size of the required screening material, and at the same time solves the problem of high replacement cost after the screen plate 4 is damaged.

[0023] See Figures 1 to 4 As shown, the utility model crossbeam 3 includes two arc-shaped plates 3-1 and a transverse rib plate 3-2 fixed in the middle of the two arc-shaped plates 3-1 and extending upward from the arc-shaped plates 3-1. A soil steel beam can be used. A slot is formed between the two arc-shaped plates 3-1. The arc-shaped plates 3-1 are provided with a plurality of transverse mounting holes. The radial rib plate 2 includes a radial bottom plate 2-1 and an upper radial rib plate 2-2. The radial bottom plate 2-1 is provided with a plurality of radial mounting holes. The ends of each radial bottom plate 2-1 are respectively provided in the limiting grooves of the two arc-shaped plates 3-1 and are welded and fixed. The radial rib plate 2 can be fully welded after being intermittently welded in sections, which can reduce welding deformation, ensure coaxiality and increase the strength of the drum frame. The utility model provides sieve plate 4 with sieve plate mounting holes corresponding to the transverse mounting holes and the radial mounting holes on its periphery, bolts are passed through the sieve plate mounting holes and the transverse mounting holes and the radial mounting holes corresponding to the sieve plate 4 and are fixed with nuts to fix the sieve plate 4 on the drum frame, and the sieve plate 4 can be partially or completely replaced according to the local wear conditions.

[0024] See Figures 1 to 4As shown, the bag breaking knife assembly of the utility model includes a first knife group, a second knife head 9 and a third knife head 10. Since three knife heads with different structures can be used for bag breaking, the garbage bag breaking rate is ≥98%. Figures 3 to 5 As shown, the first knife group of the utility model is intermittently arranged along the spiral trajectory of the inner wall of the screen drum. 3 to 5 first knife groups are arranged on each section of the screen drum of the utility model. The first knife group of the utility model is intermittently arranged along the inner wall of the screen drum in a variable spiral trajectory, such as a spiral height of 1250 and two circles.

[0025] See Figure 1 , 3 As shown in Figures 5 to 5, the first knife group of the utility model includes a knife disc 7, at least three first knife heads 8 and a fixed clamping plate 6. The knife disc 7 is L-shaped, including a knife head mounting plate 7-2 and an arc-shaped connecting seat 7-1 that fits with the screen plate 4. The triangular first knife head 8 is mounted on the upper part of the knife head mounting plate 7-2 by fasteners. An alloy blade 8-1 is fixed on the acute angle side of the first knife head 8 and the top surface of the knife head mounting plate 7-2, so that the alloy blade 8-1 faces the side of the screen cylinder. The first knife head 8 is made of 16Mn, and the alloy blade 8-1 is welded to the alloy blade 8-1. Therefore, the bagged garbage in the screen cylinder can be broken by the alloy blade 8-1. The arc-shaped connecting seat 7-1 of the cutter disc 7 of the utility model is provided with a cutter seat mounting hole 7-4, and bolts are passed through the cutter seat mounting hole 7-4 of the arc-shaped connecting seat 7-1 and the through hole on the fixed clamping plate 6 located outside the screen cylinder and fixed with nuts. The cutter disc 7 is installed on the screen cylinder, which is convenient for replacing the worn first cutter head 8 and can also adjust the installation position and number of the cutter disc 7 according to the nature of the material, the discharge amount and the sorting particle size.

[0026] See Figure 5 As shown, the height H of the cutter disc 7 of the utility model is 250mm-450mm, and 3-5 first cutter heads 8 can be arranged on the cutter disc 7. For example, when the height of the cutter disc 7 is 250-300mm, three first cutter heads 8 are evenly installed on the cutter disc 7, and when the height is 300-400mm, four first cutter heads 8 can be evenly installed on the cutter disc 7. Therefore, the number of first cutter heads can be set according to the material properties, screening particle size and screen drum size. Figure 4 , 5 As shown, a plurality of cutter head reinforcing ribs 7-3 are fixed between the arc-shaped connecting seat 7-1 and the cutter head mounting plate 7-2 of the utility model, so as to improve the strength of the cutter head 7. The angle α between the alloy blade 8-1 on the first cutter head 8 and the top surface of the cutter head mounting plate 7-2 is between 70-75°. For example, the angle α between the alloy blade 8-1 on the first cutter head 8 and the plane of the cutter head mounting plate 7-2 is 72°. Since the angle of the alloy blade 8-1 on the first cutter head 8 can be adjusted, the bag can be broken better and the material can be crushed, while reducing the wear of the alloy blade 8-1.

[0027] In order to improve the assembly efficiency, the utility model has a knife seat mounting hole 7-4 of the arc-shaped connecting seat 7-1 of the knife disc 7 with a symmetrical plane, the knife seat mounting hole 7-4 is a square hole, and the bolt is a semi-circular head square neck bolt, so the square hole on the knife seat mounting hole 7-4 limits the rotation of the bolt, the fixed clamping plate 6 is an arc-shaped clamping plate, and a long slot hole is provided in the fixed clamping plate 6, so that the installation position of the knife disc 7 can be conveniently changed according to needs, the square neck of the bolt is set in the knife seat mounting hole 7-4 and is restricted from rotating, and the bolt passes through the screen plate 4 and the long slot hole of the fixed clamping plate 6 and is fixed with a nut.

[0028] See Figure 3 , 4 As shown, the second cutter head 9 of the utility model is correspondingly mounted on the second cutter seat 2-3 through fasteners, and the second cutter head 9 has a plurality of pitch-tooth blades on the top, and the plurality of pitch-tooth blades on the top of the second cutter head 9 face one side of the screen cylinder. When the screen cylinder rotates clockwise, the serrated blade on the top of the second cutter head 9 is used to break the bag of the advancing packaged garbage, thereby improving the bag breaking efficiency.

[0029] See Figure 3 , 4 As shown, the third cutter head 10 of the utility model is correspondingly installed on the third cutter seat 2-4 through fasteners. The third cutter head 10 is a triangular shape with a small top and a large bottom. The third cutter head 10 is provided with a cutting edge on the side of the alloy blade 8-1. The top surface of the third cutter head 10 is a plane with sharp spikes. When the screen drum rotates clockwise, the packaging garbage is broken through the cutting edge, and the sharp spikes on the top easily pierce the garbage bag, thereby improving the bag breaking efficiency. The cutting edge angle of the third cutter head 10 of the utility model is between 7 and 15°. If the cutting edge angle is 10°, the cutting edge of the third cutter head 10 and the sharp spikes on the top are used to break the packaging garbage bag.

Claims

1. A bag breaking and screening mechanism for a drum screen, characterized in that: It includes a roller assembly and a bag breaking knife assembly for breaking bags and crushing materials; The roller assembly comprises a roller frame, a front roller ring (1), a rear roller ring (5) and a plurality of screen plates (4) assembled together. The roller frame comprises a plurality of cross beams (3) and a plurality of arc-shaped radial ribs (2). The ends of the plurality of cross beams (3) uniformly distributed along the circumference are respectively connected to the front roller ring (1) and the rear roller ring (5) and can be disassembled. Each radial rib plate (2) is radially fixed on two cross beams (3) to form circumferential rib plates and a plurality of circumferential rib plates are provided along the length direction. The circumferential rib plates on the front and rear sides are respectively connected to the front roller ring (1). The rear rolling ring (5) is connected and can be disassembled, a mesh plate opening is formed between two cross beams (3) and two radial ribs (2), the mesh plate (4) is an arc-shaped mesh plate with a mesh hole (4-1), each mesh plate (4) is correspondingly installed on the cross beam (3) and the radial rib (2) to cover the corresponding mesh plate opening and can be disassembled, and each mesh plate (4) is assembled into a circular screen cylinder; each circumferential rib is provided with at least two second knife seats (2-3) and at least two third knife seats (2-4) on the inner wall of the radial rib (2); The bag breaking knife assembly comprises a first knife group, a second knife head (9) and a third knife head (10), wherein the first knife group is intermittently arranged along the spiral track of the inner wall of the screen cylinder, the first knife group comprises a knife disc (7), at least three first knife heads (8) and a fixed clamping plate (6), the knife disc (7) is L-shaped, comprising a knife head mounting plate (7-2) and an arc-shaped connecting seat (7-1) fitted with the screen plate (4), the triangular first knife head (8) is mounted on the upper part of the knife head mounting plate (7-2) by means of fasteners, an alloy blade (8-1) is fixed on one side of the acute angle between the first knife head (8) and the top surface of the knife head mounting plate (7-2), the arc-shaped connecting seat (7-1) of the knife disc (7) is provided with a knife seat mounting plate The mounting hole (7-4) is provided, and bolts are passed through the knife seat mounting hole (7-4) of the arc-shaped connecting seat (7-1) and the through hole on the fixed clamping plate (6) located outside the screen cylinder and fixed with nuts to install the knife disc (7) on the screen cylinder; the second knife head (9) is correspondingly installed on the second knife seat (2-3) through fasteners, and the top of the second knife head (9) has a plurality of toothed blades, and the third knife head (10) is correspondingly installed on the third knife seat (2-4) through fasteners, and the third knife head (10) is a triangular shape with a small top and a large bottom, and the side edge of the third knife head (10) located on the same side as the alloy blade (8-1) is provided with a cutting edge, and the top surface of the third knife head (10) is a plane with sharp spikes.

2. A bag breaking and screening mechanism for a drum screen according to claim 1, characterized in that: The crossbeam (3) comprises two arc-shaped plates (3-1) and a transverse rib plate (3-2) fixed in the middle of the two arc-shaped plates (3-1) and extending upward from the arc-shaped plates (3-1); a slot is formed between the two arc-shaped plates (3-1); and a plurality of transverse mounting holes are provided on the arc-shaped plates (3-1); the radial rib plate (2) comprises a radial bottom plate (2-1) and an upper radial rib plate (2-2); and a plurality of radial mounting holes are provided on the radial bottom plate (2-1); the ends of each radial bottom plate (2-1) are respectively provided in the limiting grooves of the two arc-shaped plates (3-1) and are welded and fixed; the periphery of the screen plate (4) is provided with screen plate mounting holes corresponding to the transverse mounting holes and the radial mounting holes; bolts are passed through the corresponding screen plate mounting holes and the transverse mounting holes and the radial mounting holes on the screen plate (4) and are fixed with nuts to fix the screen plate (4) on the drum frame.

3. A bag breaking and screening mechanism for a drum screen according to claim 1, characterized in that: The inner walls of the front rolling ring (1) and the rear rolling ring (5) are circumferentially provided with a plurality of front guide plates (1-2) and rear guide plates which are inclined and have the same angle. The front guide plates (1-2) and the rear guide plates are staggered in the front and rear directions. The outer walls of the front rolling ring (1) and the rear rolling ring (5) are fixed with a raised front wear-resistant ring (1-1) and a raised rear wear-resistant ring (5-1).

4. The bag breaking and screening mechanism for a drum screen according to claim 1, characterized in that: The height H of the cutter disc (7) is 250 mm to 450 mm, and a plurality of cutter disc reinforcing ribs (7-3) are fixed between the arc-shaped connecting seat (7-1) and the cutter head mounting plate (7-2), and the angle α between the alloy blade (8-1) on the first cutter head (8) and the top surface of the cutter head mounting plate (7-2) is between 70° and 75°.

5. The bag breaking and screening mechanism for a drum screen according to claim 1, characterized in that: The knife seat mounting hole (7-4) on the arc-shaped connecting seat (7-1) of the knife disc (7) has a symmetrical plane, the bolt is a semicircular head square neck bolt, the fixed clamping plate (6) is an arc-shaped clamping plate, a long slot hole is provided in the fixed clamping plate (6), the square neck of the bolt is arranged in the knife seat mounting hole (7-4) and is restricted from rotating, and the bolt passes through the long slot hole of the screen plate (4) and the fixed clamping plate (6) and is fixed with a nut.

6. The bag breaking and screening mechanism for a drum screen according to claim 1, characterized in that: The distance between the center of the second tool holder (2-3) and the center of the adjacent third tool holder (2-4) is 400-500 mm.

7. A bag breaking and screening mechanism for a drum screen according to claim 1 or 6, characterized in that: The multiple toothed blades on the top of the second cutter head (9) face one side of the screen cylinder.

8. The bag breaking and screening mechanism for a drum screen according to claim 1, characterized in that: The cutting edge angle of the third cutting head (10) is between 7 and 15 degrees.

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